You're looking at this all wrong, trying to create arguments to fit a pre-defined answer.
In general, being wrong about A doesn't mean you have to be wrong about B, being wrong or being right isn't always clear cut in football, the important thing is what the opinion is based on. As an example, lets look at Mkhi at the start of last season, his stats alone were sublime but everything behind the numbers were worrying, yet people were being ridiculed and "had an agenda" for pointing it out. Suggesting we'd be better off playing Lingard, before it became a popular opinion, was even worse. People just didn't understand the concept of it, until it became glaringly obvious and "everyone" jumped on it. If people didn't understand it in the first place, i'm not sure they understood it once it became a popular opinion either.
In regards to Rashford, i argued that if our intention was to keep rotating him out wide, we'd be better off loaning him out to a team that'd be willing to play him as a striker. Obviously we'd be worse off now if we had loaned him out, but Rashford is being given the chance to nail down his place as a striker, a chance Mourinho was not willing to give him. People ridicule the notion that he should've been loaned out, mocking Redknapp for stating it, pointing to how he's performing now, but they're completely missing the key point.
The Pogba debate isn't easy to compare, it's not as clear cut as you pretend it is, a large part of it was down to forum members having a go at him because they supported Mourinho.
In regards to Lukaku, it's tempting to bring up the earlier debates and the references made to Saha vs Nistelrooy, Firminio at Liverpool. You can replace a player that has superior goalscoring stats with a different type of player and get the entire team to perform better. The key is mobility, players constantly changing positions and making themselves available to receive the ball, occupying players so that others are free to receive the ball. The Lukaku we've seen for the past 12 months is not a player that fits into those plans, so either he improves in the time he has until summer or we'll most likely try to offload him and get someone in that fits the football we're trying to play. A good performance against Arsenal doesn't change anything in terms of the bigger picture.